<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    .container .cart {
      width: 300px;
      margin: auto;
    }

    .container .title {
      background-color: lightblue;
      height: 40px;
      line-height: 40px;
      text-align: center;
      /*color: #fff;*/
    }

    .container .total {
      background-color: #FFCE46;
      height: 50px;
      line-height: 50px;
      text-align: right;
    }

    .container .total button {
      margin: 0 10px;
      background-color: #DC4C40;
      height: 35px;
      width: 80px;
      border: 0;
    }

    .container .total span {
      color: red;
      font-weight: bold;
    }

    .container .item {
      height: 55px;
      line-height: 55px;
      position: relative;
      border-top: 1px solid #ADD8E6;
    }

    .container .item img {
      width: 45px;
      height: 45px;
      margin: 5px;
    }

    .container .item .name {
      position: absolute;
      width: 90px;
      top: 0;
      left: 55px;
      font-size: 16px;
    }

    .container .item .change {
      width: 100px;
      position: absolute;
      top: 0;
      right: 50px;
    }

    .container .item .change a {
      font-size: 20px;
      width: 30px;
      text-decoration: none;
      background-color: lightgray;
      vertical-align: middle;
    }

    .container .item .change .num {
      width: 40px;
      height: 25px;
    }

    .container .item .del {
      position: absolute;
      top: 0;
      right: 0px;
      width: 40px;
      text-align: center;
      font-size: 40px;
      cursor: pointer;
      color: red;
    }

    .container .item .del:hover {
      background-color: orange;
    }
  </style>
</head>
<body>
  <div id="app">
    <div class="container">
      <my-cart></my-cart>
    </div>
  </div>
  <script src=".//vue.js"></script>
  <script>
    const list = [{
      id: 1,
      name: 'TCL彩电',
      price: 1000,
      num: 1,
      img: 'img/a.jpg'
    },{
      id: 2,
      name: '机顶盒',
      price: 1000,
      num: 1,
      img: 'img/b.jpg'
    },{
      id: 3,
      name: '海尔冰箱',
      price: 1000,
      num: 1,
      img: 'img/c.jpg'
    },{
      id: 4,
      name: '小米手机',
      price: 1000,
      num: 1,
      img: 'img/d.jpg'
    },{
      id: 5,
      name: 'PPTV电视',
      price: 1000,
      num: 3,
      img: 'img/e.jpg'
    }]

    const cartHeader = {
      props: ['title'],
      template: `<div class="title">{{title}}的商品456</div>`
    }

    const cartList = {
      props: ['list'],
      template: `<div>
        <div class="item" v-for="item in list" :key="item.id">
          <img :src="item.img"/>
          <div class="name">{{item.name}}</div>
          <div class="change">
            <a href="" @click.prevent="subNum(item.id)">－</a>
            <input type="text" class="num" :value="item.num" @blur="changeNum(item.id, $event)" />
            <a href="" @click.prevent="addNum(item.id)">＋</a>
          </div>
          <div class="del" @click="delFn(item.id)">×</div>
        </div>
      </div>`,
      methods: {
        delFn(id) {
          this.$emit('delid', id)
        },
        changeNum(id, e) {
          this.$emit('changenum', {id: id, type: 'change',num: e.target.value - 0})
        },
        subNum(id) {
          this.$emit('changenum', {id: id, type: 'sub'})
        },
        addNum(id) {
          this.$emit('changenum', {id: id, type: 'add'})
        },
      }
    }

    const cartTotal = {
      props: ['list'],
      computed: {
        total() {
          let result = 0

          this.list.forEach(item => {
            result += item.price * item.num
          })

          return result
        }
      },
      template: `<div class="total">
        <span>总价：{{total}}</span>
        <button>结算</button>
      </div>`
    }

    Vue.component('my-cart', {
      data() {
        return {
          username: '张三',
          list: list
        }
      },
      components: {
        'cart-header': cartHeader,
        'cart-list': cartList,
        'cart-total': cartTotal
      },
      template: `<div class='cart'>
        <cart-header :title="username"></cart-header>
        <cart-list @changenum="changeFn" :list="list" @delid="clearItem"></cart-list>
        <cart-total :list="list"></cart-total>
      </div>`,
      methods: {
        changeFn({id, type, num}) {
          if(type ==='change') {
            this.list.some(item => {
              if(item.id === id) {
                item.num = num
                return true
              }
            })
          } else if(type === 'sub') {
            this.list.some(item => {
              if(item.id === id) {
                item.num -= 1
                return true
              }
            })
          } else if(type === 'add') {
            this.list.some(item => {
              if(item.id === id) {
                item.num += 1
                return true
              }
            })
          }
         
        },
        clearItem(id) {
          let index
          this.list.forEach((item, i) => {
            if(item.id == id) {
              index = i
            }
          })
          this.list.splice(index, 1)
        }
      }
    })

    const vm = new Vue({
      el: '#app',
      data: {

      }
    })
  </script>
</body>
</html>
